Rotary pump



April All, 1933- c. EjANDERsoN ROTARY PUMP 3 'sheets-sheet 1 Filed June 5, 1928 l NVENTOR y ,MY Z TORNEYS April 11, 1933. c; E. ANDERSON ROTARY PUMP 3 sheets-sheet '2' Filed June 6, 1928 www Nw/ ww NN R. w im w .4% ,i M V 1 W NN 1| O Mw L# Sw wz f MN m3 Sw m5 W ilszf April 1l, 1933 c. E, ANDERSON ROTARY PUMP 5 sheets-sheet' s Filed' June e, 1928 w l A .gq mounted a rotor or rotary element, each ro- 40 ment positionedV therein whichl acts as a Worn through abnormal Patented Apr. 11, 1933 UNITED STATES PATENTLoFFIcE) CARL E. ANDERSON, or BROOKLYN, NEW Yom: Y A

ROTARY PUMP Application led .Tune l6,`

. may be readily replaced in the event that becomes necessary. 1

A further object of this invention is .the provision of a rotary pump having a plurality of pump chambers, vin each of which is tary element being. mounted eccentrically and the rotary elements in the adjacent compartments being in oppositionto each other as far as the eccentric mounting is concerned;

- an abutment roller having rotary contact with each of'said rotors, .the partition separating the pump compartments or chambers being extended sufficiently to iseparate the abutment rollers from each other.

. VA further object of this linvention. is the provision in connection with the abutment rollers previously referred to, of a bearing surface element of long life and which `may be readily replaced in the event it `becomes or very extended usage.

A further object of this invention is the provision in combination with the pump` casing, of a discharge outlet having a screen elescreen and also as means to restrict the "discharge flow so as to buildV up pressure upon the abutment rollersto assist in retaining them 1n engagement with the rotatingsurfaces of the rotors.

Further objectsof this invention include improvements in details of construction and arrangement, whereby a rotary pump of simple construction is provided, which isreadily 1928. Serial No. 283,150. t

adaptable to mass production and which has a high efliciency, and operates quietly. r

To the accomplishment of the foregoing and such other objects as may hereinafter' ap;

pear, this invention-consists in the construc-l tion, combmatlon and arrangement 0f parts hereinafter described, and then soughtto Ibe defined in the appended claims,reference` being had to the-accompanying drawings forming a part hereof, and which show merely for the purpose of illustrative disclosure, a pref:

ferredembodiment of Vmy invention, it being expressly understood however, that various changesmay be made in practice `Withinithe scope of the claims Without digressing from my inventive idea.

In the-drawings: f Fig. l represents a longitudinal vertical cross sectional view of one form of pump constructed to embody my invention.

' Fig. 2 represents a lvertical transverse cross `section taken through one ofthepump chambers or compartments thereof.

Fig. v3 is a viewsimilarto Fig. '2 with the rotor and other parts shown in the position assumed after a yrotation of approximately Fig. 4 vis an end View taken substantially on line 4-4 of Fig. '1, parts being .shownin section to facilitate the disclosure.

Fig. V5 is a vertical transverse cross section taken substantially von line 'mof Fig. 1.:

, Fig. 6 is a side elevation of one of the ro-V tors.

bearing surface elements removed, .part being broken awayto illustrate the interior construction thereof.

Referring now to the drawings, the nue:

meral l, designates the pump casing, as a whole. This is preferably formed of the body part, 2, and the end plates or members Fig. 7 is a perspective view of one'of `the 3 and 4 adapted to be secured to leach side i of the body 2 by means of bolts y5. 1 The end plate 3 is formed with thehollow boss or projection 6, adapted to receive the bushing or bearing 7 to -form the end bearing for the driving shaft 8, which .alsohas a bearing in the bushing .or bearing 9 positioned in Y the extension l0 from the other end plate 4. A suitable packing gland 11 is provided in this end to insure a fluid-tight connection.

The body member 2 has a partition member 12 permanently securedA thereto, as by means of screws, 13, so as to divide the casing into a plurality of pump chambers or compartments and this partition is provided with an extension element 14 offset'on the upper side thereof and which is of sui'cient length to lextend into the discharge c-ompartment 15 which communicates with the outlet 16 formed in the upper part of the body member 2. This outlet 16 has a comparatively restricted opening 17 in which isjmounted a screen element 18 which operates to further restrict the discharge flow and therefore build up pressure withinl the dischargeV compartment 15. The screen also serves to keep foreignf'materials out of the pump. rlhis body member 2 is also provided with'an inlet compartment 19 which communicates with the inlet connection 20 and provides a source of iiuidY supply for the pump.

As shown inthe drawings the extension element 14 is' preferably a separate element and is preferably secured in vposition on top of the partition 12 by means of the screw or bolt 2l. Itis to be expressly understoodv that while I'have illustrated onlyfone parti-tion and extension .14, that the same construction. may be utilized to provide a multiplicity of pump chambers or compartmentswithinithe pumpV casing 1; alsofthat only one pump chamber or compartment may be used. Fur- Y so asfto provide the extended base orl footv on aradius or diameter less than that ofk the internal diameter ofthe pump chamber 4.51

thermore, vattention is vdirectedV to thel fact that the body 2 of the pump casing is formed construction 22. f The rotors 23 are Yof course preferably slmilarinconformatlon and dimension, andi are keyed, as at 24,'to the shaft 8.I These rotors arev of general circular construction,

or compartment.` VHowever, aV substantial portion Vof the, edge or periphery'of each rotor 23 is formed on the same radius anddiameter as the inner surface kof the pump chamber or compartment, this being indi-v cated'in Fig. 6 of the drawings between the reference characters 25 and 26. There is a slight clearance between this surface 25, 26,- and the inner surface of the cylinder, which is exaggerated in the. drawings for purposes ofrdisclosure. rI`he rotors 23'are bored ec centrically as at 27 to receive the shaft` 8-and they aremountedupon the shaft in opposition to each other, as far as their eccentricity is concerned.

I provide, in each pump chamber or compartment, the rotary abutment member 28, which is positioned in .the space vbetween the partition 12 and its extension element 14 on the one hand, and the sides 3 or 4 of the pump ycasing on the other hand as the case may be, or, in the multiple construction, between the various partitions in the'case of the intermediate pump chambers or compartments. Each rotary abutment 28 is mounted in an off center posit-ion or rather,

'2V of the casing. This bearing surface element is formed of material having a long life and I khave found for example that a bakelite or phenol condensation product is suitable'for the purpose. In one form, this bearing sur'- face 29 is built up of such material and a plurality of plies of strong fabric. As the contact of the rotary abutment28 therewith is movable, it is seen that the life of such a bearingsurface element must be very eX- tensive. As the pump is operated, the rotary abutment member 28 has, beside its relatively high speed of rotation, a vertical slidingmotion relative tothe bearing surface 29. In order to prevent the abutment member from becoming scored'or pitted or unevenly worn due to the vertical sliding contact with surface 29, it is necessary that the bearing surface be formed of a relatively tough substance having a -low coeliicient of friction. T\/\7henthe abutment member is lmade of metallic materiahthe bearing surface 29 is preferably formed of a non-metallic substance such asa phenolic condensationV product,lig num-vitae, libre, leather or the like.y Atvthis point I desire to call 'attention to the vfact that the rotary abutmentmay be character- ,ized as free rolling and positively' acting.

Furthermore, it is subject to a minimum amount of wear and friction, and may bey operated at standard speeds and also at much higherspeeds'. VThe total'weight of the rotary abutment is supported on the rotor. The

bearing surface element 29 is Apreferably ara gear construction therein. This housing is,

connected to `the' end of the extension v10 and includes the housing lhavingthe integral side member 82 and the separable end or side member 33. The side member 32 is bored to receive the driving shaft 8 and the packing 34 and the end member 33 is provided with a hollow projection 35 and a bushing or bearing 36 to afford an end bearing for the shaft. The lower portion ofthis end member 33 is formed as an extended foot or base 33 in parallelism or in the same plane with the exended foot or base 22 of the pump casing or ody.

Worm gear 37 is keyed to the shaft 8 within the housing 31 and is in mesh with the worm 38 keyed to the driving shaft 39 which extends through the lower portion of the housing at right angles to the driving shaft 8 and has suitable journals or bearings 40 thereon. This driving shaft 39 is directly connected to a motor so that the pump has a Y direct drive. l

In operation, rotation of the shaft 8 will result in rotation of the rotors 23 in the direction of the arrow, and during this rotation each rotor will act to carry a char-ge of water from the inlet compartment 19 to the discharge chamber or compartment 15. When the part of the rotor which is formed on the larger diameter indicated at 25 and 26, and which may be called a lobe, is at the top or upper part of the pump casing; both the inlet and discharge ports or chambers are closed so as to eliminate any possibility of back pressure. Furthermore, the ldischarge port or chamber is closed before the inlet port or chamber is opened. As the rotor moves to the left or in the direction of the arrow, see Fig. 2, the space in the pump chamber which receives the incoming fluid, increases in capacity until the cut-off surface or lobe cuts off the inlet port. As the rotor moves further, this space opens into or communicates with, the discharge chamber or compartment 15 and the water is gradually forced thereinto and out through the discharge outlet due to the convergence of the surface of the rotor and the inner surface ofV the pump casing. Of course the rotary abutment 28 is always in contact with the upper surface of the rotor 23 between the inlet port and the opening into the discharge chamber compartment and insures the discharge of the fluid under pressure. This rotary abutment is held in position by the force of gravity and by the pressure in the discharge chamber or compartment 15. This completes the description of a cycle of operation.

Of course, it is understood that I may utilize in this pump construction a single rotor, and, also, instead of having a single lobe or cut-ofi surface 25, 26,1 may have two or more for each rotor. Furthermore, it is to be understood, that the screen element may be omitted, if desired. It is however, desirable to use it in some high speed installa tions. Y f

-It is to fbe particularly noted that there ',are `no* springs or other parts liable ito fqu-ick deterioration, and' `that the rotary abutment has a, rolling contactat two points fon'ly, 'resulting-in a minimum Vwear of all the; parts and also resulting in uniformity at whatever wear eventuates so that long use of `this construction will result in no decrease in etliciency. i

Furthermore, attention is also directed to the self-contained driving and pump construction embodied in a single unitary construction, which lends itselfV to mass production and to `use for small installations as well as large ones.

This construction maybe used as a vacuum pump, compressor and for handling a light and heavy liquid and also as an air or liquid motor as well as a meter.

What I claim is:

1. An apparatus of the character described, including, in combination, a casing" having a circular pump chamber and a common abutment and outlet chamber therein, a partition dividing said chambers into a plurality of compartments toV provide a duplex pump, said partition being inserted and fixedly secured in said casing, a shaft, journaled in said casing, a rotor mounted eccentrically on said shaft in each of said compartments, each rotor having an extended cutoff surface, said casing havingan inlet and an outlet adapted to communicate with said compartments, said partition having an extension ixedly secured thereto extending into said outlet chamber, a cylindrical rotary abutment member for each compartment positioned between said inlet and outlet and bearing upon the upper surface of its rotor, said rotary abutments being separated by said extension and also having a side and end bearing or contact with part of the casing.

2. An apparatus of the character described comprising a casing having a circular pump chamber and a common abutment and outlet chamber therein, a circular partition plate fixedly secured in said casing for axially dividing said pump chamber into a plurality of pumping compartments, a shaft journalled in said casing, a rotor mounted eccentrically on said shaft in each of said compartments, said casing having common inlet and outlet openings for said compartments, said partition plate having an extension plate secured thereto, said extension plate being positioned in said outlet chamber, a cylindrical Vrotary abutment member positioned in each abutment chamber between said inlet and outlet openings, resting freely on the surunaV ing rolling and slidingy contacts with' said lhearing member', said bearing member Vconsisting ofa tough, knon-metallic substance having a 10W co-eicient of friction;

In testimony that I claim the foregoing, I have hereunto set my hand this 26th day of May, 1928.

CARL E. ANDERSON. 

